The Dirt Devil Air Purifier is designed to make your personal space. bedroom. office or nursery cleaner. Vents surrounding the entire system pull air through the H13 HEPA Media filter to trap up to 99.97% of dirt. dust and allergens. while eliminating odors. It's energy efficient so you can leave it on all night and sleep undisturbed in Night Mode. The built-in timer allows you to move throughout your day and not worry about if you remembered to turn off your air purifier.